Currently, China has the highest number of diabetics in the world. Having diabetes can increase the risk of developing brain infarction by 2-5 times. Moreover, strokes occur at a younger age in diabetic patients than in non-diabetic patients. The main reason for the increase in the prevalence of cerebrovascular disease caused by diabetes is that high blood sugar accelerates the atherosclerosis of blood vessels, which eventually leads to cerebrovascular disease. Prevention should be as early as possible The prevention and treatment of hyperglycemia should start from the early stage of life. Establish good living habits, do not smoke, and resolve to quit smoking if you already smoke. Regular body checkups should be conducted to detect abnormal lipid metabolism and mild elevation of blood glucose and blood pressure early, and treat them early to restore them to normal level. Treatment starts from usual people with cardiovascular and cerebrovascular risk factors should have their blood glucose tested regularly, and glycated hemoglobin (HbA1c) and glycated plasma albumin should be measured if necessary. When elevated blood glucose is found and diabetes is confirmed by the diagnosis of endocrinology, intensive control of high blood glucose should be carried out, and more importantly, blood glucose should be kept stable. In general, the recommended therapeutic target for HbA1c is <7.0%. For patients with ischemic stroke, individualized glycemic control targets should be set with full consideration of the patient's own situation and drug safety while lowering glucose therapy, and the hazards associated with hypoglycemic events should be guarded against. Prevention and treatment of diabetes-related complications Regular examinations of diabetes-related complications, such as carotid intima-media thickness, pulse wave conduction velocity, and urinary microalbumin, should be performed to detect vascular lesions as early as possible so that effective treatment measures can be taken. Also actively correct lipid metabolism disorders and hypertension, which will help prevent and delay the occurrence of cerebrovascular disease.